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Author Message   Brcamera Tinkerer Username: Brcamera Post Number: 262 Registered: 08-2010 Rating: N/A Votes: 0 Posted on Saturday, April 06, 2013 - 07:27 pm:    The parts you show in the photo simply advance the mechanism via the pawl, or reset it by turning the inner shaft counterclockwise. Pretty basic and other than the screw that holds the pawl assembly in place, all the parts are accounted for in the photo. If you have the pawl assembly keyed on to the inner knob and it still does not reset, then there is some issue under the mechanism plate. By the way, the title says A12 back, but you do not have an A(automatic)12 back, shown is the early 12 back. Bill